Use the following information to answer the next three exercises. The Sky Train from the terminal to the rental-car and long-term parking center is supposed to arrive every eight minutes. The waiting times for the train are known to follow a uniform distribution.

79.

What is the average waiting time (in minutes)?

1. zero
2. two
3. three
4. four

80.

Find the 30^th percentile for the waiting times (in minutes).

1. two
2. 2.4
3. 2.75
4. three